{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "## 8.4 \u521b\u5efa\u5927\u91cf\u5bf9\u8c61\u65f6\u8282\u7701\u5185\u5b58\u65b9\u6cd5\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "### \u95ee\u9898\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u4f60\u7684\u7a0b\u5e8f\u8981\u521b\u5efa\u5927\u91cf(\u53ef\u80fd\u4e0a\u767e\u4e07)\u7684\u5bf9\u8c61\uff0c\u5bfc\u81f4\u5360\u7528\u5f88\u5927\u7684\u5185\u5b58\u3002"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "### \u89e3\u51b3\u65b9\u6848\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u5bf9\u4e8e\u4e3b\u8981\u662f\u7528\u6765\u5f53\u6210\u7b80\u5355\u7684\u6570\u636e\u7ed3\u6784\u7684\u7c7b\u800c\u8a00\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u7ed9\u7c7b\u6dfb\u52a0 __slots__ \u5c5e\u6027\u6765\u6781\u5927\u7684\u51cf\u5c11\u5b9e\u4f8b\u6240\u5360\u7684\u5185\u5b58\u3002\u6bd4\u5982\uff1a"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {},
      "outputs": [],
      "source": [
        "class Date:\n    __slots__ = ['year', 'month', 'day']\n    def __init__(self, year, month, day):\n        self.year = year\n        self.month = month\n        self.day = day"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u5f53\u4f60\u5b9a\u4e49 __slots__ \u540e\uff0cPython\u5c31\u4f1a\u4e3a\u5b9e\u4f8b\u4f7f\u7528\u4e00\u79cd\u66f4\u52a0\u7d27\u51d1\u7684\u5185\u90e8\u8868\u793a\u3002\n\u5b9e\u4f8b\u901a\u8fc7\u4e00\u4e2a\u5f88\u5c0f\u7684\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\u6765\u6784\u5efa\uff0c\u800c\u4e0d\u662f\u4e3a\u6bcf\u4e2a\u5b9e\u4f8b\u5b9a\u4e49\u4e00\u4e2a\u5b57\u5178\uff0c\u8fd9\u8ddf\u5143\u7ec4\u6216\u5217\u8868\u5f88\u7c7b\u4f3c\u3002\n\u5728 __slots__ \u4e2d\u5217\u51fa\u7684\u5c5e\u6027\u540d\u5728\u5185\u90e8\u88ab\u6620\u5c04\u5230\u8fd9\u4e2a\u6570\u7ec4\u7684\u6307\u5b9a\u5c0f\u6807\u4e0a\u3002\n\u4f7f\u7528slots\u4e00\u4e2a\u4e0d\u597d\u7684\u5730\u65b9\u5c31\u662f\u6211\u4eec\u4e0d\u80fd\u518d\u7ed9\u5b9e\u4f8b\u6dfb\u52a0\u65b0\u7684\u5c5e\u6027\u4e86\uff0c\u53ea\u80fd\u4f7f\u7528\u5728 __slots__ \u4e2d\u5b9a\u4e49\u7684\u90a3\u4e9b\u5c5e\u6027\u540d\u3002"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "### \u8ba8\u8bba\n"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u4f7f\u7528slots\u540e\u8282\u7701\u7684\u5185\u5b58\u4f1a\u8ddf\u5b58\u50a8\u5c5e\u6027\u7684\u6570\u91cf\u548c\u7c7b\u578b\u6709\u5173\u3002\n\u4e0d\u8fc7\uff0c\u4e00\u822c\u6765\u8bb2\uff0c\u4f7f\u7528\u5230\u7684\u5185\u5b58\u603b\u91cf\u548c\u5c06\u6570\u636e\u5b58\u50a8\u5728\u4e00\u4e2a\u5143\u7ec4\u4e2d\u5dee\u4e0d\u591a\u3002\n\u4e3a\u4e86\u7ed9\u4f60\u4e00\u4e2a\u76f4\u89c2\u8ba4\u8bc6\uff0c\u5047\u8bbe\u4f60\u4e0d\u4f7f\u7528slots\u76f4\u63a5\u5b58\u50a8\u4e00\u4e2aDate\u5b9e\u4f8b\uff0c\n\u572864\u4f4d\u7684Python\u4e0a\u9762\u8981\u5360\u7528428\u5b57\u8282\uff0c\u800c\u5982\u679c\u4f7f\u7528\u4e86slots\uff0c\u5185\u5b58\u5360\u7528\u4e0b\u964d\u5230156\u5b57\u8282\u3002\n\u5982\u679c\u7a0b\u5e8f\u4e2d\u9700\u8981\u540c\u65f6\u521b\u5efa\u5927\u91cf\u7684\u65e5\u671f\u5b9e\u4f8b\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5c31\u80fd\u6781\u5927\u7684\u51cf\u5c0f\u5185\u5b58\u4f7f\u7528\u91cf\u4e86\u3002"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u5c3d\u7ba1slots\u770b\u4e0a\u53bb\u662f\u4e00\u4e2a\u5f88\u6709\u7528\u7684\u7279\u6027\uff0c\u5f88\u591a\u65f6\u5019\u4f60\u8fd8\u662f\u5f97\u51cf\u5c11\u5bf9\u5b83\u7684\u4f7f\u7528\u51b2\u52a8\u3002\nPython\u7684\u5f88\u591a\u7279\u6027\u90fd\u4f9d\u8d56\u4e8e\u666e\u901a\u7684\u57fa\u4e8e\u5b57\u5178\u7684\u5b9e\u73b0\u3002\n\u53e6\u5916\uff0c\u5b9a\u4e49\u4e86slots\u540e\u7684\u7c7b\u4e0d\u518d\u652f\u6301\u4e00\u4e9b\u666e\u901a\u7c7b\u7279\u6027\u4e86\uff0c\u6bd4\u5982\u591a\u7ee7\u627f\u3002\n\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u4f60\u5e94\u8be5\u53ea\u5728\u90a3\u4e9b\u7ecf\u5e38\u88ab\u4f7f\u7528\u5230\u7684\u7528\u4f5c\u6570\u636e\u7ed3\u6784\u7684\u7c7b\u4e0a\u5b9a\u4e49slots\n(\u6bd4\u5982\u5728\u7a0b\u5e8f\u4e2d\u9700\u8981\u521b\u5efa\u67d0\u4e2a\u7c7b\u7684\u51e0\u767e\u4e07\u4e2a\u5b9e\u4f8b\u5bf9\u8c61)\u3002"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\u5173\u4e8e __slots__ \u7684\u4e00\u4e2a\u5e38\u89c1\u8bef\u533a\u662f\u5b83\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u5c01\u88c5\u5de5\u5177\u6765\u9632\u6b62\u7528\u6237\u7ed9\u5b9e\u4f8b\u589e\u52a0\u65b0\u7684\u5c5e\u6027\u3002\n\u5c3d\u7ba1\u4f7f\u7528slots\u53ef\u4ee5\u8fbe\u5230\u8fd9\u6837\u7684\u76ee\u7684\uff0c\u4f46\u662f\u8fd9\u4e2a\u5e76\u4e0d\u662f\u5b83\u7684\u521d\u8877\u3002\n__slots__ \u66f4\u591a\u7684\u662f\u7528\u6765\u4f5c\u4e3a\u4e00\u4e2a\u5185\u5b58\u4f18\u5316\u5de5\u5177\u3002"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.7.1"
    },
    "toc": {
      "base_numbering": 1,
      "nav_menu": {},
      "number_sections": true,
      "sideBar": true,
      "skip_h1_title": true,
      "title_cell": "Table of Contents",
      "title_sidebar": "Contents",
      "toc_cell": false,
      "toc_position": {},
      "toc_section_display": true,
      "toc_window_display": true
    }
  },
  "nbformat": 4,
  "nbformat_minor": 2
}